Sovereign by April Daniels is the sequel to Dreadnought (2017). It's been nine months since Danny took the mantel of Dreadnought and already she is feeling the stress of being a hero. She's also fighting for emancipation from her transphobic parents.
Meanwhile there is a new global threat. There's an asteroid approaching that seems to be tied to the super powers that some people get. But now a supervillain has found a way to control it and who gets and doesn't get affected by it.
As with so many second books, more emphasis is put on the action scenes — on seeing Dreadnought in action. There are times to see her excel, times to see her go too far, and times to see her fail. Although there is the on-going plot of her parents' poor reaction to her gender it feels tagged on this time.
Put another way, there were so many scenes of different fights that the strong world building and character building just wasn't there to as strong a degree. Basically, this story feels rushed. It could have been two books to give the competing plot threads more time and space.